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Next: <a href="wcsxfrm.html#wcsxfrm" accesskey="n" rel="next">wcsxfrm</a>, Previous: <a href="wcstok.html#wcstok" accesskey="p" rel="prev">wcstok</a>, Up: <a href="Wchar-strings.html#Wchar-strings" accesskey="u" rel="up">Wchar strings</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<a name="wcswidth_002d_002d_002dnumber-of-column-positions-of-a-wide_002dcharacter-string"></a>
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<h3 class="section">6.28 <code>wcswidth</code>—number of column positions of a wide-character string</h3>
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<a name="index-wcswidth"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <wchar.h>
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int wcswidth(const wchar_t *<var>pwcs</var>, size_t <var>n</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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The <code>wcswidth</code> function shall determine the number of column
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positions required for <var>n</var> wide-character codes (or fewer than <var>n</var>
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wide-character codes if a null wide-character code is encountered
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before <var>n</var> wide-character codes are exhausted) in the string pointed
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to by <var>pwcs</var>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The <code>wcswidth</code> function either shall return 0 (if <var>pwcs</var> points to a
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null wide-character code), or return the number of column positions
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to be occupied by the wide-character string pointed to by <var>pwcs</var>, or
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return -1 (if any of the first <var>n</var> wide-character codes in the
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wide-character string pointed to by <var>pwcs</var> is not a printable
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wide-character code).
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>wcswidth</code> has been introduced in the Single UNIX Specification Volume 2.
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<code>wcswidth</code> has been marked as an extension in the Single UNIX Specification Volume 3.
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